![]() The CED Millenium 2 Chronograph uses this principle: The sensors are available for replacement: I don't know how much the OP can save on a $200 gadget if time has any value at all. You then calculate based on rotation speed, angular difference and spacing between the discs how fast the projectile would need to be.ģ of my 4 chronographs use an optical system looking for the glint off the bullet as it pass over the sensor. You know the rotation speed of your discs and you check the angular difference between the puncture holes in each disc. The projectile hits and passes through the first disc and then hits and passes through the second disc. Have 2 discs that rotate say a few feet apart coupled to each other. There is one other possibly dirt-cheap mechanical solution. You would have to be accurate to shoot through the middle and not blow up your loops. Obviously copper tipped or full metal jacket ammo would have different effects but still create a momentary change in current. Then when you remove iron and get back to original air centre it will again change current for a moment and settle back, right? If these changes could be detected with this be enough? I'm thinking for a pellet gun that shoots. I mean, if you have air coil with some current going through and then you stick an iron rod into the middle, it will alter the current for a moment and then equalize again to a steady state once the iron magnetizes. Would it be possible to put 2 large induction coils several feet apart and shoot a projectile through them? Have them connected to an Arduino or RasPi and see if a "blip" shows up when your projectile travels through it? Then take time diffference to determine velocity? Most projectiles being lead I am not sure what magnitude of effect it would have on the induction loop, if any, and the huge speed it is travelling past may not even register.
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